Adapter assembly including a removable trocar assembly

ABSTRACT

An adapter assembly for connecting a loading unit to a handle assembly is provided. The adapter assembly includes a sleeve, a removable trocar assembly releasably securable with the sleeve, and a locking assembly configured to releasably secure the trocar assembly within the sleeve. The locking assembly includes first and second button members and corresponding first and second locking members for releasably securing the trocar assembly.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 14/994,457, filed Jan. 13, 2016, now U.S. Pat. No. 10,524,797, the disclosure of which is incorporated by reference herein in its entirety.

BACKGROUND Technical Field

The present disclosure relates to reusable surgical stapling devices. More particularly, the present disclosure relates to reusable adapter assemblies including a removable trocar assembly for use with a circular stapler.

Background of Related Art

Surgical devices for applying staples, clips, or other fasteners to tissue are well known. Typically, endoscopic stapling devices include an actuation unit, i.e., a handle assembly for actuating the device and a shaft for endoscopic access, and a tool assembly disposed at a distal end of the shaft. In certain of these devices, the shaft includes an adapter assembly, having a proximal end securable to the handle assembly and a distal end securable to the tool assembly. The adapter assembly may include an extension.

The adapter assembly may be reusable. To facilitate sterilization and cleaning of the adapter assembly, it would be beneficial to have an adapter assembly including a removable trocar assembly.

SUMMARY

An adapter assembly for connecting a loading unit to a handle assembly is provided. The adapter assembly includes a sleeve, a trocar assembly releasably securable with the sleeve, and a locking assembly configured to releasably secure the trocar assembly within the sleeve. The locking assembly includes first and second button members, and corresponding first and second locking members selectively movable in response to movement of the first and second button members. The first and second locking members are configured for selective reception within the respective first and second locking openings of the trocar housing.

In embodiments, the first and second locking members are moveable between a first position where the trocar assembly is securely received within the sleeve and a second position where the trocar assembly is removable from within the sleeve. The first and second button members may be configured to move the respective first and second locking members between the first position and the second position. The first and second locking members may be biased to the first position by respective first and second springs. The first and second locking members may maintain the respective first and second button members in an outward position when the first and second locking members are in the first position.

The locking assembly of the adapter assembly may further include an internal housing defining first and second recesses. The first and second button members may be received within the respective first and second recesses. The internal housing may further define first and second apertures. The first and second locking members may be received within the respective first and second apertures. The internal housing may also define at least one flush port. The adapter assembly may further include inner and outer flexible band assemblies. In addition, the adapter assembly may include a base, and a handle rotatably secured to the base, wherein a proximal end of the sleeve is fixedly secured to the handle to permit rotation of the sleeve.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above, and the detailed description of the embodiments given below, serve to explain the principles of the disclosure, wherein:

FIG. 1 is a perspective view of a surgical stapling device including an handle assembly with an adapter assembly according to an embodiment of the present disclosure;

FIG. 2 is a perspective view of a distal end of the adapter assembly shown in FIG. 1;

FIG. 3 is another perspective view of the distal end of the adapter assembly shown in FIG. 1;

FIG. 4 is a perspective view of a drive assembly of the adapter assembly shown in FIG. 1, with components separated;

FIG. 5 is a side perspective view of a distal end of the adapter assembly shown in FIG. 1 with the sleeve removed, a locking assembly with parts separated, and a removable trocar assembly removed;

FIG. 6 is a perspective view of the removable trocar assembly shown in FIG. 5, with parts separated;

FIG. 7 is a side perspective view of an internal housing of the locking assembly of the adapter assembly shown in FIG. 1;

FIG. 8 is a cross-sectional end view taken along section line 8-8 shown in FIG. 7;

FIG. 9 is a side perspective view of a button member of the locking assembly shown in FIG. 5;

FIG. 10 is a cross-sectional top view taken along section line 10-10 shown in FIG. 13;

FIG. 11 is side perspective view of a locking member of the locking assembly shown in FIG. 5;

FIG. 12 is a perspective end view of the trocar assembly and locking assembly shown in FIG. 5, with the outer sleeve shown in phantom and the internal housing removed;

FIG. 13 a cross-sectional end view taken along section line 13-13 shown in FIG. 2;

FIG. 14 is a cross-sectional side view taken along section line 14-14 shown in FIG. 13;

FIG. 14A is a cross-sectional side view of an adapter assembly according to an alternative embodiment of the present disclosure, taken along section 14-14 shown in FIG. 13;

FIG. 15 is a cross-sectional perspective end view of taken along section lines 13-13 shown in FIG. 2 with the locking assembly in an unlocked condition;

FIG. 16 is a cross-sectional perspective end view of taken along section lines 13-13 shown in FIG. 2 with the locking assembly in an unlocked condition and the trocar assembly being retracted; and

FIG. 17 is an enlarged view of the cross-sectional perspective end view shown in FIG. 16.

DETAILED DESCRIPTION

Embodiments of the presently disclosed reusable adapter assembly including a removable trocar assembly will now be described in detail with reference to the drawings in which like reference numerals designate identical or corresponding elements in each of the several views. As is common in the art, the term “proximal” refers to that part or component closer to the user or operator, i.e. surgeon or clinician, while the term “distal” refers to that part or component further away from the user.

Referring initially to FIG. 1, an adapter assembly according to an embodiment of the present disclosure, shown generally as adapter assembly 100, is a component of a surgical stapling device 10. The surgical stapling device 10 further includes a powered handle assembly 20, a loading unit 30, and an anvil assembly 40. Although shown and described with reference to surgical stapling device 10, the aspects of the present disclosure may be modified for use with manual surgical stapling devices having various configurations, and with powered surgical stapling devices having alternative configurations. For a detailed description of exemplary surgical stapling devices, please refer to commonly owned U.S. Pat. No. 9,023,014 (“the '014 patent) and U.S. Pat. Appl. Publ. No. 2012/0253329 (“the '329 publication”), the contents of each of which are incorporated by reference herein in their entirety.

The adapter assembly 100 includes a proximal portion 102 configured for operable connection to the handle assembly 20 and a distal portion 104 configured for operable connection to the loading unit 30 and to the anvil assembly 40. Although shown and described as forming an integral unit, it is envisioned that the proximal and distal portions 102, 104 may be formed as separate units that are releasably securable to one another.

The adapter assembly 100 will only be described to the extent necessary to fully disclose the aspects of the present disclosure. For a detailed description of an exemplary adapter assembly, please refer to commonly owned U.S. patent application Ser. No. 14/875,766 (“the '766 application”), the contents of which is incorporated by reference herein in its entirety.

With additional reference to FIGS. 2 and 3, the adapter assembly 100 includes an outer sleeve 106, and a connector housing 108 secured to a distal end of the outer sleeve 106. The connector housing 108 is configured to releasably secure an end effector, e.g., the loading unit 30 (FIG. 1), to the adapter assembly 100.

Turning briefly to FIG. 4, the adapter assembly 100 (FIG. 2) includes a drive assembly 110 extending through the outer sleeve 106 (FIG. 13) of the adapter assembly 100, and includes an inner flexible band assembly 112 and an outer flexible band assembly 114. The inner flexible band assembly 112 includes first and second flexible bands 112 a, 112 b, and an inner pusher member 116 connected to the distal ends of the first and second flexible bands 112 a, 112 b. Similarly, the outer flexible band assembly 114 includes first and second flexible bands 114 a, 114 b, and an outer pusher member 118. For a detailed description of the structure and function of the drive assembly 110, please refer to the '766 application, the content of which was previously incorporated herein by reference in its entirety.

With reference now to FIG. 5, the adapter assembly 100 further includes a trocar assembly 120 configured to attach to, and selectively position an anvil assembly, i.e., anvil assembly 40 (FIG. 1), relative to the loading unit 30 (FIG. 1), and a locking assembly 130 that releasably secures the trocar assembly 120 relative to the outer sleeve 106 of the adapter assembly 100. The trocar assembly 120 will only be described to the extent necessary to fully disclose the aspects of the present disclosure. For a detailed description of the structure and function of an exemplary trocar assembly, please refer to the '766 application, the content of which was previously incorporated by reference herein in its entirety.

Briefly, and with additional reference to FIG. 6, the trocar assembly 120 of the adapter assembly 100 (FIG. 1) includes an outer housing 122, a trocar member 124 slidably disposed within the outer housing 122, and a drive screw 126 operably received within the trocar member 124 for axially moving the trocar member 124 relative to the outer housing 122. More specifically, the trocar member 124 defines a threaded bore 124 a which is dimensioned to receive the drive screw 126. The outer surface of the drive screw 126 is threaded such that rotation of the drive screw 126 causes longitudinal movement of the trocar member 124 within the outer housing 122 of the trocar assembly 120. A distal end 124 b of trocar member 124 is configured to releasably engage an anvil assembly, e.g., the anvil assembly 40 (FIG. 1). Proximal and distal bearing assemblies 128 a, 128 a are mounted to a proximal end of outer housing 122 of trocar assembly 120 for rotatably supporting the drive screw 126 within the outer housing 122 and the trocar member 124. As will be described in further detail below, the outer housing 122 includes a cutout 123 defining first and second locking openings 123 a, 123 b (FIG. 15) for receiving the respective locking portions 136 c, 138 c of the respective first and second locking members 136, 138 (FIG. 11) of the locking assembly 130 of the adapter assembly 100.

Referring back to FIG. 5, the locking assembly 130 of the adapter assembly 100 (FIG. 2) includes an internal housing 140 disposed within the outer sleeve 106 (FIG. 2) of the adapter assembly 100, first and second button members 132, 134 movably supported within the internal housing 140, and first and second locking members 136, 138 in operable engagement with the respective first and second button members 132, 134. As will be described in further detail below, each of the first and second button members 132, 134 and the first and second locking members 136, 138 are movably supported within the internal housing 140. Movement of the first and second button members 132, 134 is configured to move the respective first and second locking members 136, 138 from a locked position (FIG. 13) to an unlocked position (FIG. 15) against the bias of first and second springs 142 a, 142 b, respectively, engaged by the first and second locking members 136, 138, respectively.

With additional reference to FIGS. 7 and 8, the internal housing 140 of the locking assembly 130 includes a substantially cylindrical body defining a rectangular cutout 131 extending a length thereof through which the drive assembly 110 (FIG. 4) and trocar assembly 120 (FIG. 6) are received. In particularly, the internal housing 140 defines longitudinal grooves 131 a, 131 b extending along either side of the cutout 131 for receiving the outer housing 122 (FIG. 5) of the trocar assembly 120 (FIG. 5).

The internal housing 140 further defines first and second recesses 133, 135 in fluid communication with the cutout 131. Each of the first and second recesses 133, 135 is configured to operably receive the respective first and second button members 132, 134 (FIG. 9). More particularly, the first and second recesses 133, 135 include an enlarged portion 133 a, 135 a, respectively, for accommodating a base portion 132 a, 134 a (FIG. 9) of the respective first and second button members 132, 134. The first and second recess 133, 134 further include first and second slots 133 b, 135 b extending across the rectangular cutout 131 for accommodating a stem portion 132 b, 134 b (FIG. 9) of the respective first and second button members 132, 134. Each of the enlarged portions 133 a, 135 a of the first and second recesses 133 a, 135 a includes a pair of grooves 133 c, 135 c for slidingly receiving tab portions 132 c, 134 c (FIG. 9) extending from each of the base portions 132 a, 134 a, respectively, of the respective first and second button members 132, 134.

With continued reference to FIGS. 7 and 8, the internal housing 140 further defines first and second apertures 137, 139 (FIG. 13) in fluid communication with the cutout 131. The first and second apertures 137, 139 are configured to operably receive the respective first and second locking members 136, 138. More particularly, each of the first and second apertures 137, 139 includes a cylindrical portion 137 a, 139 a (FIG. 13), respectively, for accommodating a base portion 136 a, 138 a of the respective first and second locking members 136, 138, a rectangular portion 137 b, 139 b (FIG. 13) for accommodating a flange portion 136 b, 138 b of the respective first and second locking members 136, 138, and openings 137 c, 139 c (FIG. 13) extending into the rectangular cutout 131 for receiving locking portions 136 c, 138 c, respectively, of the respective first and second locking member 136, 138. As will be described in further detail below, the first recess 133 aligns with the second aperture 139, and the second recess 135 aligns with the first aperture 137 such that the first button member 132 engages the second locking member 138 and the second button member 134 engages the first locking member 136.

The internal housing 140 of the locking assembly 130 also defines first and second flush ports 141, 143 in fluid communication with the cutout 131. The first and second flush ports 141, 143 facilitate cleaning of the adapter assembly 100 following removal of the trocar assembly 120. The outer sleeve 106 of the adapter assembly 100 defines a pair of openings 107 b (FIGS. 2 and 3) corresponding to the flush ports 141, 143. An insert 144 is receivable within the cutout 131 of the internal housing 140 of the locking assembly 130 for maintaining alignment of the drive assembly 110 through the internal housing 140.

Turning briefly to FIG. 9, as noted above, each of the first and second button members 132, 134 includes the base portion 132 a, 134 a, tab portions 132 c, 134 c, respectively, and the stem portion 132 b, 134 b, respectively, extending from the respective base portion 132 a, 134 a.

With particular reference to FIG. 10, the second button member 134 is received within the second recess 135 of the internal housing 140 with the base portion 134 a received within the enlarged portion 135 a of the second recess 135, the tab portion 134 b is received within the respective grooves 135 b of the second recess 135, and the stem portion 134 c is received within the slot 135 c of the second recess 135. The opening 107 a in the outer sleeve 106, through which the second button member 134 protrudes, is dimensioned such that the tab portions 134 b engage the outer sleeve 106 and retain the second button member 134 within the second recess 135. Although only the second button member 134 is shown and described in detail, the first button member 132 is similarly situated within the first recess 133.

With reference now to FIG. 11, the first and second locking members 136, 138 each include the base portions 136 a, 138 a, respectively, the flange portions 136 b, 138 b extending outwardly from the respective base portions 136 a, 138 a, and the locking portions 136 c, 138 c extending from the respective base portions 136 a, 138 a. As shown, the base portions 136 a, 138 a and the locking portions 136 c, 138 c are substantially cylindrical. It is envisioned that either or both of the base portions 136 a, 138 a and the locking portions 136 c, 138 c may be any suitable shape. As will be described in further detail below, the first and second locking members 136, 138 operate to releasably secure the trocar assembly 120 within the outer sleeve 106 of the adapter assembly 100.

The operation of the locking assembly 130 of the adapter assembly 100 will now be described with reference to FIGS. 12-17. Referring initially to FIGS. 12-14, the locking assembly 130 is shown in the locked configuration, i.e., with the first and second locking members 136, 138 in their first position. More particularly, the first and second locking members 136, 138 of the locking assembly 130 are biased by the respective first and second springs 142 a, 142 b such that the locking portions 136 c, 138 c of the respective first and second locking members 136, 138 are received within the first and second locking openings 123 a, 123 b, respectively, formed in the outer housing 122 of the trocar assembly 120.

In the locked configuration, the stem portions 132 b, 134 b of the respective first and second button members 132, 134 of the locking assembly 130 extend across the cutout 131 of the internal housing 140 and engage the respective flange portions 136 b, 138 b of the first and second locking members 136, 138, respectively. The first and second button members 132, 134 are maintained in an initial position through engagement of the second and first locking members 138, 136, respectively, and the inward bias of the respective first and second spring 142 b, 142 a.

The trocar assembly 120 of adapter assembly 100 may be provided preloaded within outer sleeve 106 of the adapter assembly 100, or the trocar assembly 120 may be provided separated from the adapter assembly 100. If provided as a separate component, the trocar assembly 120 is loaded through a distal end of the outer sleeve 106 of the adapter assembly 100 prior to attaching an end effector, e.g., the end effector 30, to the connector housing 108 of the adapter assembly 100. The trocar assembly 120 is fed into the outer sleeve 106 of the adapter assembly 100 through the cutout 131 of the internal housing 140. In order to receive the trocar assembly 120 through the internal housing 140, the locking assembly 130 is moved to the unlocked position (FIG. 16), in a manner as will be described in detail below. Alternatively, and with reference to FIG. 14A, the first and second locking members 136, 138 may include a chamfered distal surface 136 d, 138 d that, when engaged by a proximal end of the trocar assembly 120, pushes the first and second locking members 136, 138 against the bias of the first and second spring 142 a, 142 b to the unlocked position to permit passage of the trocar assembly 120 through the cutout 131 of the internal housing 140.

Upon alignment of the first and second locking openings 123 a, 123 b of the outer housing 122 of the trocar assembly 120 with the locking portions 136 c, 138 c of the respective first and second locking members 136, 138, the first and second springs 142 a, 142 b bias the locking portions 136 c, 138 c of the first and second locking members 136, 138 into the respective first and second locking openings 123 a, 123 b of the outer housing 122. An audible and/or tactile indication may be provided to a user by the locking assembly 130 as the first and second locking members 136, 138 are received with the respective first and second locking openings 123 a, 123 b to indicate that the trocar assembly 120 is securely received within the locking assembly 130.

In embodiments, the outer housing 122 of the trocar assembly 120 includes flat portions 125 (FIG. 13) for maintaining rotational alignment of the trocar assembly 120 relative to the locking assembly 130 to ensure that the first and second locking openings 123 a, 123 b of the trocar assembly 120 are maintained in alignment with the respective first and second locking members 136, 138 of the locking assembly 130.

Once the trocar assembly 120 is loaded within the sleeve 106, and secured therein by the locking assembly 130, the adapter assembly 100, the attached handle assembly 20 (FIG. 1), the attached loading unit 30 (FIG. 1), and the attached anvil assembly 40 (FIG. 1) operate in a traditional manner.

Following a surgical stapling procedure using the surgical stapling device 10, the trocar assembly 120 of the adapter assembly 100 is removed from the sleeve 106 of the adapter assembly 100 to facilitate cleaning and/or sterilizing of the adapter assembly 100. As noted above, the simultaneous pressing of the first and second button members 132, 134 of the locking mechanism 130 disengages the first and second locking members 136, 138 from the trocar assembly 120. The distal end 124 b of the trocar member 124 may be grasped and pulled relative to outer sleeve 108 to remove the trocar assembly 120 from the adapter assembly 100. By requiring both the first and second button members 132, 134 to be depressed simultaneously to unlock the lock assembly 130, accidental release of the trocar assembly 120 is prevented in the event of inadvertent pressing of only one of the first and second button members 132, 134.

With reference to FIGS. 15-17, the locking assembly 130 of the adapter assembly 100 is shown with the first and second locking members 136, 138 in their second or unlocked position. To move the first and second locking members 136, 138 to the unlocked position, the second and first button members 134, 132, respectively, are depressed, as indicated by arrows “A” in FIG. 15. Engagement of the stem portions 138 c, 136 c of the respective second and first button members 134, 132 with the flange portions 136 b, 138 b, respectively, of the respective first and second locking members 136, 138 moves the first and second locking members 136, 138 against the bias of the first and second springs 142 a, 142 b radially outward, as indicated by arrows “B” in FIG. 15.

When the first and second locking members 136, 138 are in the second position, the locking portions 136 c, 138 c of the respective first and second locking members 136, 138 are withdrawn from the respective first and second locking openings 123 a, 123 b of the outer housing 122 of the trocar assembly 120, and the trocar assembly 120 is removable from within the outer sleeve 106 of the adapter assembly 100. Once the trocar assembly 120 is separated from the adapter assembly 100, the adapter assembly 100 may be cleaned and/or sterilized in a traditional manner.

Any of the components described herein may be fabricated from either metals, plastics, resins, composites or the like taking into consideration strength, durability, wearability, weight, resistance to corrosion, ease of manufacturing, cost of manufacturing, and the like.

Persons skilled in the art will understand that the devices and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments. It is envisioned that the elements and features illustrated or described in connection with one exemplary embodiment may be combined with the elements and features of another without departing from the scope of the present disclosure. As well, one skilled in the art will appreciate further features and advantages of the disclosure based on the above-described embodiments. Accordingly, the disclosure is not to be limited by what has been particularly shown and described, except as indicated by the appended claims. 

What is claimed is:
 1. A locking mechanism for releasably securing a trocar assembly within a sleeve of an adapter assembly, the locking mechanism comprising: a housing supportable within the sleeve of the adapter assembly; first and second button members supported within the housing and selectively movable between a first position and a second position; first and second locking members corresponding to the first and second button members, the first and second locking members being selectively movable in response to movement of the respective first and second button members, the first and second locking members being configured for selective reception within respective first and second locking openings of the trocar assembly; and, first and second springs configured to bias the respective first and second locking members to a locked position.
 2. The locking mechanism of claim 1, wherein the first and second locking members move from the locked position to an unlocked position in response to the respective first and second button members moving from the first position to the second position.
 3. The locking mechanism of claim 2, wherein the first and second locking members are configured to be received within the respective first and second locking openings in the trocar assembly when the first and second locking members are in the locked position.
 4. The locking mechanism of claim 3, wherein the first and second locking members are configured to be laterally spaced from the respective first and second locking openings in the trocar assembly when the first and second locking members are in the unlocked position.
 5. The locking mechanism of claim 1, wherein the housing defines first and second recesses, the first and second button members being received within the respective first and second recesses.
 6. The locking mechanism of claim 5, wherein the housing defines first and second apertures, the first and second locking members being received within the respective first and second apertures.
 7. The locking mechanism of claim 6, wherein the housing further defines at least one flush port.
 8. The locking mechanism of claim 1, wherein the first and second locking members move in parallel relation to one another.
 9. The locking mechanism of claim 1, wherein the first and second button members move in parallel relation to one another.
 10. An adapter assembly configured to connect a loading unit to a handle assembly, the adapter assembly comprising: a sleeve; a trocar assembly releasably securable within the sleeve, the trocar assembly including a trocar housing defining first and second locking openings; and a locking mechanism for releasably securing the trocar assembly within the sleeve, the locking mechanism including: a housing supported within the sleeve; first and second button members supported within the housing and selectively movable between a first position and a second position; first and second locking members corresponding to the first and second button members, the first and second locking members being selectively movable in response to movement of the respective first and second button members, the first and second locking members being configured for selective reception within the respective first and second locking openings of the trocar assembly; and, first and second springs configured to bias the respective first and second locking members to a locked position.
 11. The adapter assembly of claim 10, wherein the first and second locking members move from the locked position to an unlocked position in response to the respective first and second button members moving from the first position to the second position.
 12. The adapter assembly of claim 11, wherein the first and second locking members are configured to be received within the respective first and second locking openings in the trocar assembly when the first and second locking members are in the locked position.
 13. The adapter assembly of claim 12, wherein the first and second locking members are configured to be laterally spaced from the respective first and second locking openings in the trocar assembly when the first and second locking members are in the unlocked position.
 14. The adapter assembly of claim 10, wherein the housing defines first and second recesses, the first and second button members being received within the respective first and second recesses.
 15. The adapter assembly of claim 14, wherein the housing defines first and second apertures, the first and second locking members being received within the respective first and second apertures.
 16. The adapter assembly of claim 15, wherein the housing further defines at least one flush port.
 17. The adapter assembly of claim 10, wherein the first and second locking members move in parallel relation to one another.
 18. The adapter assembly of claim 10, wherein the first and second button members move in parallel relation to one another.
 19. The adapter assembly of claim 10, further including inner and outer flexible band assemblies.
 20. The adapter assembly of claim 10, further including a base, and a handle rotatably secured to the base, wherein a proximal end of the sleeve is fixedly secured to the handle to permit rotation of the sleeve.
 21. A locking mechanism for releasably securing a trocar assembly within a sleeve of an adapter assembly, the locking mechanism comprising: a housing supportable within the sleeve of the adapter assembly; first and second button members supported within the housing and selectively movable between a first position and a second position; first and second locking members corresponding to the first and second button members, the first and second locking members being selectively movable in response to movement of the respective first and second button members between a locked position and an unlocked position, the unlocked position being radially spaced outward of the locked position, the first and second locking members being configured for selective reception within respective first and second locking openings of the trocar assembly; and, first and second biasing members configured to bias the respective first and second locking members to a locked position. 